But I'll take Rock-Ryback over Rock-Cena any day of the week. I get the feeling they'll be doing the old next big thing vs. the new next big thing

Don't see much people mentioning Rock vs. Taker though, he is one of the guys Rock mentioned during that WM press conference last year. It would be a big time match (even though there is obviously no chance Rock winning, that's not really the point. The point is that it would be a marquee match)